Table 1.

Early childhood caries (ECC) in Hong Kong preschool children

Author (years of conduct) [Ref]	Age (years)	Sample size	ECC prevalence	Mean dmft
Wong (1968)15a	5–6	–	87%	5.3
Wei et al (1993)16a	5	1,105	63%	3.2
Chu et al (1999)17a	4	240	36%	0.9
	5	367	56%	1.8
Department of Health (2001)18	5	67,300	51%	2.3
Chu et al (2009)19	4	239	41%	1.9
	5	338	48%	2.3
Department of Health (2011)20	5	52,300	51%	2.5
Chen et al (2016)21	5	505	55%	2.7

Note:

^a Year of publication was presented instead because year of conduct was not specified.

Abbreviations: ECC, early childhood caries; dmft, decayed, missing and filled teeth.